pcf26100 NXP Semiconductors, pcf26100 Datasheet - Page 11

• Manufacturer Part Number: pcf26100
• Description: Bluetooth Adapter Ic
• Manufacturer: NXP Semiconductors

Philips Semiconductors
6.3.2
The PCF26100 is reset with a Power-on reset using the
VIO_POWER signal. This will reset all registers and put
the device into a known state. The POR_EXT reset signal
will also reset the device and put it in the same state as the
Power-on reset. However, POR_EXT is intended to be
used for a reset from a host.
Following the Power-on reset or a reset by POR_EXT, the
system oscillator is started and the SYS_CLK output is
activated (enabled). The SYS_CLK output can be
controlled by the SYS_CLK_REQ signal but only if the ‘rdy’
bit in the Control Register has been set to logic 1.
2001 Jun 19
handbook, full pagewidth
Bluetooth Adapter IC
SYS_CLK_REQ
R
VIO_POWER
ESET
POR_EXT
SYS_CLK
LPO_CLK
OSC
POR
phase 1 Rdy = 0
Fig.4 Reset timing.
11
The function of SYS_CLK_REQ has 2 phases:
1. After reset, SYS_CLK_REQ is not taken into account
2. Once the ‘rdy’ bit is set to logic 1, the 13 MHz clock on
The SYS_CLK_REQ signal will not control or disable the
oscillator.
The LPO_CLK output is only controlled by the POR_EXT
signal which also controls the POR output. The POR is
activated 4 SYS_CLK cycles after POR_EXT.
for the generation of SYS_CLK. After reset the 13 MHz
system clock is enabled on SYS_CLK.
the SYS_CLK is controlled with SYS_CLK_REQ.
phase 2 Rdy = 1
Preliminary specification
PCF26100
MGT755